Apparatus for hot-air heating systems



Dec. 21 1926.

glmpms J. C. MILES APPARATUS FOR HOT AIR HEATING SYSTEMS 2 Sheets-Sheet Filed June '7, 1925 .YZIVENTOR BY 792/5 AT n/N 4 H 1 1/ s m a flm 9 e E m V z z M m J M WQ 5 Y. s G 3., L III M 7T Cmw mm SF U T A R A P P. A pm 2 9 1" 1 2 QM Pv D f atented Dec. 2i, lh fi.

JAMES ('1. MILES, F

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APPARATUS FOR HOT-AIR HEATING SYSTEMS.

Application filed June 7,

5. co-pending application Serial No. 430,160

filed 'December 13, 1920, i. e. Patent No.

1,508,831, issued Sept. 16, 1924.

Briefly, the apparatus illustrated in my co-pending application embodies a fan and a damper which are arranged to be positioned adjacent'the inlet of the heating chamber of a furnace. The damper is'arranged to be opened when the fan is stopped, and to be closed when the fan is in operation.

Une of the objects of the present invention, is the arrangment of mechanism Whereby the fan may be positioned remote from the furnace while the damper may bedisposed adjacent the usual air inlet conduit to the heating chamber. This permits the fan to be positioned remote from the furnace and in an accessible location, and also permitsair to be drawn from. regions dif ferent from that used for the normal operation of the furnaceon the gravity system. I carry out the above objects by providing. a motor driven fan having a conduit lead- 1 ing therefrom to the furnace and-by soarranging a damper in the conduit that actuation of the fan breates pneumatic pressure sufficient to close the damper. The dampers are also arranged to open automatically when the artificial pressure created'by the fan is diminished. r The means for carrying out the above objects will be hereinafter more fully described in connection with the accompanying draw= ings, while the essential features will be sum- "niarized in the claims.

Tn the drawings, Fig. l is aside elevation partly in section of a hot air furnace, having my invention embodied therein; Fig. 2

a is a horizontal section taken through the apparatus shown in Fig. 1 Fig. 3 is a similar horizontal section through a modification or my invention. in Fig. 1', T have shown the heating cham-. berof a hot air furnace at 10 with an air. conduit 11 leading thereto. My invention 0 as heretofore stated comprises a fan and system, is that within 1923. Serial no. 643357.

heating chamber may be increased. In the .preferred form, the dampers and fan control the admission of air to the heating chamber.

through the same conduit 11. Thus, in Fig.

1, the dampers are illustrated at 12 as being.

disposed in the sides oftheconduit while the fan is disposed Within the conduit and isindicated in general at 18.

With the arrangement above described,

air is admitted to the. heating chamber.

through the-dampers 12 when the furnace is operating "on a gravity system and in this case, the air is taken from. theroom in which the furnace is located. The type of damper employed is preferably that shown and described in my co-pending application, Serial No. 630,740, filed April 9, v

15123. Briefly, the damper embodies a plate pivotally mounted on an oE-center axis so that the area ofv the plate on one side of the axis is greater than that on the other side thereof. Moreover, the pivotal connection' of each damper is inclined inwardly at the top wherefore under normal conditions the damper is held in open position. With the apparatus above set forth, the air entering the heating chamber under the gravity the room in which the furnace is located.

To utilize the conduit from which the fan receives air so that one conduit is" sufficient for supplying air under either the gravity.

or forced air systems, Ihave'shown the dampers in Fig. 8, as'disposed on opposite sidesof' the fan and as arranged to swing across the passageway when in closed position. fhave illustrated the conduit as being enlarged adjacent the fan as'at 20 and I have shown the dampers 12 as arrangedv to be disposed across the openings formed by the enlargement 20 adjacent the region of engagement with the" conduit 11. Normally,

that is,on the gravity system, the dampers are. urged to open position,-but when the separate conduits are employed for conveyfan is started, the dampers are closed bythc 1 -ing air to the heating chamber. Moreover,

the dampers are automatically closed when the fan is in operation and are automatically opened when the fan is stopped Wherefore sufiicient air is admitted to the heating chamber under the gravity system to prevent burning out of the furnace, and While the fan is in operation, the air set in motion thereby is forced to enter the heating chamber and is prevented from escaping through the damper openings.

1. In a heating apparatus, the combination with a heating chamber, of a conduit leading thereto, a fan for forcing air into the chamber'through the conduit, said conduit 'havingopenings intermediate the fan and chamber, whereby air mayenterthe chamber independently ofthe fan 0 ening, a damper mounted in the conduit a djacent 2. In a heating apparatus, the combina-" tion with a heating chamber, of a conduit leading thereto, a fan, adapted for forcing air into the chamber through the conduit,

said conduit having a vertical wall inter-- mediate the fan and chamber, and having an opening 111 the wall, whereby air may opening, and a damper pivotally mounted on the wall so as to-be held normally in open position when the fan-is stopped, and so as enter the chamber independently of thefan to be mov'edto closed position by pneumatic.

pressure whenthe fan is'in operation In testimony, whereof, I hereunto affix my signature JAMES C MILES. 

